help needed in pro street please

which car shouldI buy for speed challenges cozI only have Nitrocide andRyo Watanabe to remaining .

I'll appreciate it if you help.

Here's what I ended up using to beat all of the kings.

Drag - Ford Mustang Shelby GT500
Grip - Mitsubishi EVO X
Drift - Mazda RX8
Speed - The speed Nissan you get from one of the other racedays (although I beat Ryo with an EVO X tuned for Speed)

i use the mustang gt i won from the drag king. it works good an is up to 225. i just used it right when i got it because i could use the stage 4 parts but i can afford more now. but all my cars are good.

drag- dodge charger

grip- evo IX

drift- shelby gt500(new one)

speed-...mustang gt